Fidel Gjurgji

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SOME RESULTS OF STUDY DYNAMICS CONCETRATION OF FOSFAT JONIC AFTER MINERAL FERTILIZATION OF FISH-POND WITH THREE- CALCIK PHOSPHAT Ca3(PO4)2

Fidel Gjurgji, Elton Spaho, Alketa Ngjela

Abstract
Certain chemical substances are used for mineral fertilization of rearing reservoirs Ammonium nitrite, urea and sodium nitrate are used as source of nitrogen. The monocalcic phosphate is used as phosphorus source. For this purpose we can use lime (calcium oxide). In some rearing systems potassium compounds are used to enlarge its concentration in water. Intervals of distribution for inorganic fertilizers in water ponds are dependent on the velocity of their active substance exhausting and on their period of application. During the periods of bloom of phytoplankton, this velocity is higher and so the intervals of distribution are more frequent. In periods when we have a drop in feeding rates (e.g. in low temperatures of water), the fertilizing must be interrupted. Using chemicals as water fertilizers must very often be accompanied with organic fertilizers. The fertilizer detritus contains a great amount of microorganisms, which produce carbon dioxide during their life activity. This compound (CO2) is indispensable for biosynthesis activity of saprophyte algae.

Key words: fertilization, algae, intensification, phosphates, phytoplankton, zooplankton